4 * Copyright (C) International Business Machines Corp., 2002,2003
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/stat.h>
23 #include <linux/namei.h>
27 #include "cifsproto.h"
28 #include "cifs_debug.h"
29 #include "cifs_fs_sb.h"
32 cifs_hardlink(struct dentry *old_file, struct inode *inode,
33 struct dentry *direntry)
37 char *fromName = NULL;
39 struct cifs_sb_info *cifs_sb_target;
40 struct cifsTconInfo *pTcon;
41 struct cifsInodeInfo *cifsInode;
45 cifs_sb_target = CIFS_SB(inode->i_sb);
46 pTcon = cifs_sb_target->tcon;
48 /* No need to check for cross device links since server will do that
49 BB note DFS case in future though (when we may have to check) */
51 fromName = build_path_from_dentry(old_file);
52 toName = build_path_from_dentry(direntry);
53 if ((fromName == NULL) || (toName == NULL)) {
58 if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
59 rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
60 cifs_sb_target->local_nls,
61 cifs_sb_target->mnt_cifs_flags &
62 CIFS_MOUNT_MAP_SPECIAL_CHR);
64 rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
65 cifs_sb_target->local_nls,
66 cifs_sb_target->mnt_cifs_flags &
67 CIFS_MOUNT_MAP_SPECIAL_CHR);
68 if ((rc == -EIO) || (rc == -EINVAL))
72 d_drop(direntry); /* force new lookup from server of target */
74 /* if source file is cached (oplocked) revalidate will not go to server
75 until the file is closed or oplock broken so update nlinks locally */
76 if (old_file->d_inode) {
77 cifsInode = CIFS_I(old_file->d_inode);
79 old_file->d_inode->i_nlink++;
80 /* BB should we make this contingent on superblock flag NOATIME? */
81 /* old_file->d_inode->i_ctime = CURRENT_TIME;*/
82 /* parent dir timestamps will update from srv
83 within a second, would it really be worth it
84 to set the parent dir cifs inode time to zero
85 to force revalidate (faster) for it too? */
87 /* if not oplocked will force revalidate to get info
88 on source file from srv */
91 /* Will update parent dir timestamps from srv within a second.
92 Would it really be worth it to set the parent dir (cifs
93 inode) time field to zero to force revalidate on parent
95 CIFS_I(inode)->time = 0; */
106 cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
108 struct inode *inode = direntry->d_inode;
111 char *full_path = NULL;
112 char *target_path = ERR_PTR(-ENOMEM);
113 struct cifs_sb_info *cifs_sb;
114 struct cifsTconInfo *pTcon;
118 full_path = build_path_from_dentry(direntry);
123 cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
124 cifs_sb = CIFS_SB(inode->i_sb);
125 pTcon = cifs_sb->tcon;
126 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
128 target_path = ERR_PTR(-ENOMEM);
132 /* BB add read reparse point symlink code and Unix extensions
133 symlink code here BB */
134 if (pTcon->ses->capabilities & CAP_UNIX)
135 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
140 /* rc = CIFSSMBQueryReparseLinkInfo */
141 /* BB Add code to Query ReparsePoint info */
142 /* BB Add MAC style xsymlink check here if enabled */
147 /* BB Add special case check for Samba DFS symlinks */
149 target_path[PATH_MAX-1] = 0;
152 target_path = ERR_PTR(rc);
159 nd_set_link(nd, target_path);
160 return NULL; /* No cookie */
164 cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
166 int rc = -EOPNOTSUPP;
168 struct cifs_sb_info *cifs_sb;
169 struct cifsTconInfo *pTcon;
170 char *full_path = NULL;
171 struct inode *newinode = NULL;
175 cifs_sb = CIFS_SB(inode->i_sb);
176 pTcon = cifs_sb->tcon;
178 full_path = build_path_from_dentry(direntry);
180 if (full_path == NULL) {
185 cFYI(1, ("Full path: %s", full_path));
186 cFYI(1, ("symname is %s", symname));
188 /* BB what if DFS and this volume is on different share? BB */
189 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
190 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
193 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
194 cifs_sb_target->local_nls); */
197 if (pTcon->ses->capabilities & CAP_UNIX)
198 rc = cifs_get_inode_info_unix(&newinode, full_path,
201 rc = cifs_get_inode_info(&newinode, full_path, NULL,
205 cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",
209 direntry->d_op = &cifs_ci_dentry_ops;
211 direntry->d_op = &cifs_dentry_ops;
212 d_instantiate(direntry, newinode);
222 cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
224 struct inode *inode = direntry->d_inode;
228 struct cifs_sb_info *cifs_sb;
229 struct cifsTconInfo *pTcon;
230 char *full_path = NULL;
231 char *tmp_path = NULL;
233 unsigned char *referrals = NULL;
234 int num_referrals = 0;
239 cifs_sb = CIFS_SB(inode->i_sb);
240 pTcon = cifs_sb->tcon;
242 /* BB would it be safe against deadlock to grab this sem
243 even though rename itself grabs the sem and calls lookup? */
244 /* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
245 full_path = build_path_from_dentry(direntry);
246 /* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/
248 if (full_path == NULL) {
254 ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
255 full_path, inode, pBuffer, buflen));
256 if (buflen > PATH_MAX)
260 tmpbuffer = kmalloc(len, GFP_KERNEL);
261 if (tmpbuffer == NULL) {
267 /* BB add read reparse point symlink code and
268 Unix extensions symlink code here BB */
269 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
270 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
274 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
275 cERROR(1, ("SFU style symlinks not implemented yet"));
276 /* add open and read as in fs/cifs/inode.c */
278 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
279 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
281 cifs_sb->mnt_cifs_flags &
282 CIFS_MOUNT_MAP_SPECIAL_CHR);
284 rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
289 if (CIFSSMBClose(xid, pTcon, fid)) {
290 cFYI(1, ("Error closing junction point "
291 "(open for ioctl)"));
294 /* Query if DFS Junction */
296 kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
299 strncpy(tmp_path, pTcon->treeName,
301 strncat(tmp_path, full_path,
303 rc = get_dfs_path(xid, pTcon->ses,
306 &num_referrals, &referrals,
307 cifs_sb->mnt_cifs_flags &
308 CIFS_MOUNT_MAP_SPECIAL_CHR);
309 cFYI(1, ("Get DFS for %s rc = %d ",
311 if ((num_referrals == 0) && (rc == 0))
314 cFYI(1, ("num referral: %d",
317 cFYI(1,("referral string: %s", referrals));
326 /* BB add code like else decode referrals
327 then memcpy to tmpbuffer and free referrals
332 /* BB Anything else to do to handle recursive links? */
333 /* BB Should we be using page ops here? */
335 /* BB null terminate returned string in pBuffer? BB */
337 rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
339 ("vfs_readlink called from cifs_readlink returned %d",
349 void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
351 char *p = nd_get_link(nd);